| 摘要: |
| 精密单点定位（Precise Point Positioning，PPP）利用接收机收到的载波相位测量值进行定位，载波相位整周模糊度的固定影响着PPP的收敛速度和定位精度。采用B2a信号替代B2I信号，与B1I、B3I组成三频信号观测值组合，在此基础上对传统Bootstrapping方法加以改进，提出了一种改进的三频模糊度解算方法。该方法采用了超宽巷-超宽巷-宽巷-窄巷的解算策略，通过比较选择波长较长、电离层延迟较小、测量噪声较小的三频观测值组合，分别用于解算超宽巷组合、宽巷组合和窄巷组合的模糊度。当电离层延迟无法忽略时，所提方法通过引入额外的伪距观测量来消除在解算组合模糊度的过程中出现的电离层参数和几何参数的影响。实验表明，所提方法与传统方法在完成一次模糊度解算的时间上相差无几，但是相比于传统方法，所提方法具有更高的模糊度解算成功率。 |
| 关键词: “北斗”三号 精密单点定位 模糊度解算 三频观测值组合 Boot strapping |
| DOI： |
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| 基金项目:国家自然科学基金资助项目(61563004) |
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| A three-frequency ambiguity resolution method for BDS-3 precise point positioning |
| LAO Yuanji,XIONG Zekai,WANG Jingjun,QIN Tuanfa |
| (a.School of Computer and Electronic Information;b.Guangxi Key Laboratory of Multimedia Communications and Network Technology,Guangxi University,Nanning 530004,China) |
| Abstract: |
| Precise Point Positioning(PPP) uses the carrier phase measurement value received by the receiver to position.The fixed ambiguity of the carrier phase throughout the cycle affects the convergence speed and positioning accuracy of PPP.In this paper,B2a signal replaces B2I signal and is combined with the observed values of B1I and B3I three-frequency signal.On this base,a three-frequency ambiguity solution method is proposed to improve the traditional Boot-strapping method.The proposed method adopts the solution strategy of extra-wide-lane-extra-wide-lane-wide-lane-narrow-lane,and chooses three frequency observation combinations with longer wavelength,less ionospheric delay and less measurement noise to calculate the ambiguity of extra-wide-lane(EWL) combination,wide-lane(WL) combination and narrow-lane(NL) combination,respectively.When the ionospheric delay cannot be ignored,the proposed method eliminates the effects of ionospheric parameters and geometric parameters in the process of solving the combined ambiguity by introducing additional pseudo-range observations.The experimental results show that the proposed method has the same calculating time with the traditional method in completing a ambiguity calculation while it has a higher success calculation rate. |
| Key words: BDS-3 precise point positioning ambiguity resolution combination of three-frequency observations Boot-strapping |
